Technical > Matt Shaff's Engine Shop

offset grind crankshaft

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speedbump:
Hi, Matt, I recently posted a question pertaining to my 394 olds crankshaft as far as, anyone on the forum recommending a good reliable shop to do an offset grind to my crankshaft. the shop that i had sent it to has had it for over a year and never touched it. I recently went to that shop and picked it up undone and untouched. This gives me time to re-think my plans for building this mtr. My question to you is what will i Stand to gain if i decide to offset grind this crank. I can only stroke it up about .260 That would bring my new stroke from 3.690 to 3.950 .   What other things are involved if i was to do this. I understand the throws need to be cut down because of the bal. it would need to be checked for straightness and it would need to be nitride for hardness.  do you have any idea what the cost would be and would i really gain much in hp and performance. My new thought is to just keep the stock stroke. Bore the block to around .120  use dome pistons for more compression rebuild the mtr. the heads are fairly stock use in 2.020 intake and 1.700 ext.  and be done with it. I am running hilborn fi and a power glide trans.in a #1800 car. The car is being build as a  120" wb fed running in nostalgia racing, very limited use. Something to enjoy and have some fun. Maybe you can help me in which direction i should go. Thank you and will be waiting for your reply. Thanks again Mike

jeff/21:
you should talk to tony at ross racing engines, you don't have to buy from him just pick his brain.
when you stroke a motor check to see what is available in rods and pistons  to get the right deck height stroking usually helps a lot the limiting(HP)factor will be the heads
how are you mounting your power glide that motor has a long over hang short bell housing i made a plate that bolts to the block and shortened and welded the trans housing
good luck! keep us posted

George:
The Oldsmobile engine has how many off the shelf parts available? My guess is a small amount. Anything can be custom made. It's always a question of how much do you want to spend on your combination ? I got tired of " a little bit here and a little bit there " and put a blower combo together. Just my 2 cents. George

speedbump:
i been in touch with tony. he has been very helpful. but my question is should i go ahead and do the offset grind and whatever goes with that comb. or just bore the shxxx out of it and be done. will i gain that much hp offset grind. over over bore and have 4oo plus ci. getting the parts is not the problem.

Paul New:
the old saying there is no replacement for displacement! :o

I have always went the other way well I can't say that in the mid to early 90's we built a 422" SBC for my dads car. But other than that we have maintained the smaller CI engines compared to others we are currently running our second 387" SBC 4.125 bore 3.625 stroke but we are blown so that helps out

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